king post vs stanchion

king post

noun
  • A central vertical supporting post used in architecture and bridge as well as in aircraft and ship design. 

stanchion

noun
  • A vertical pole, post, or support. 

  • A framework of such posts, used to secure or confine cattle. 

verb
  • To confine by means of stanchions, typically used for cattle. 

  • To erect stanchions, or equip something with stanchions. 

How often have the words king post and stanchion occurred in a corpus of books? (source: Google Ngram Viewer )